fix(CollapsibileSection): Update size of chevron to align with existing design

Author: techniq

frontend/src/lib/components/CollapsibleSection/CollapsibleSection.svelte

@@ -42,7 +42,9 @@
 <Collapsible bind:open class={sizeClasses.wrapper}>
 	<div class="flex mb-3">
 		<CollapsibleTrigger class="flex items-center space-x-4">
-			<IconChevronDown class="transition-transform duration-200 {open ? '' : 'rotate-180'}" />
+			<IconChevronDown
+				class="size-4 transition-transform duration-200 {open ? '' : 'rotate-180'}"
+			/>
 			<h2 class="{sizeClasses.title} !ml-2 select-text">{title}</h2>
 		</CollapsibleTrigger>
 		<div class="flex items-center justify-between flex-1 ml-2">